One of the common concepts with auras or chi energies in a lot of popular culture medias is that a person's chi can have different colors. This is often dependant on your personality, emotions, or training.
WoW monks already draw heavily from these pop culture franchises and even has given some limited options on this front as it is. Personally I think this should be taken a step further with the addition of being able to fully customize how your chi is represented in game. I would love to choose an aspect and either have greenish mist yu'lon chi, blue/white lightning-like Xuen chi, black/white glowing Niuzao chi, and red burning Chi-Ji chi. Hell, there could also be a swirling/smoky Sha chi.
Currently everyone has "greenish" mist Yu'lon chi while some abilities use different effects depending on their origin. In a way it makes sense for a lot of abilities but at the same time it fails the fantasy of each monk having their own set of discipline and techniques if we all have basically the same chi energies.
I can see the argument that basic soul/nature/healing uses of one's chi would naturally take on the form of that greenish mist chi because the monk conjures it in that form in order for it to have healing properties to begin with. But at the same time I can also see there being support created within the lore that states that chi takes many different forms depending on the user's emotions, training, and personality. A stoic and taciturn monk would make sense to have chi that resembles that of Niuzao and it also stands to reason that his chi could be used for the same purposes as that of others (though technically maybe weaker at something like damage or healing, that doesn't need to be represented in game).
What does everyone think? Should there be a class quest line or something that lets you customize your chi? It's probably a long shot even if there is a lot of support but at least it's fun to dream about. Do you feel that chi colors should remain as is because you feel it makes sense within the established lore of the august celestials?